Peep Show - Season 04eps6 Instant

The episode centers on Mark Corrigan’s wedding day to Sophie Chapman. Despite his crippling doubts and several desperate, failed attempts to find a "valid" reason to call it off—including jumping in front of a car and attempting to bait a driver into a fight—Mark feels compelled to go through with the ceremony to avoid the social stigma of being a "jifter".

The couple reluctantly takes their vows while both are in tears—Mark from misery and Sophie from realization. Peep Show - Season 04Eps6

Fans often discuss the episode's dark tone and the sheer inevitability of the characters' failure. The episode centers on Mark Corrigan’s wedding day